Compared to other kissing emojis, its emotional expression is the most neutral. That's why it's more often used to send light affection to friends or family rather than to a romantic partner.

While its original intent is a kiss, many users interpret it as a 'whistling face' or an expression that seems to say, 'I don't know anything.' It's especially fun to use when feigning ignorance about something or trying to slyly move on after making a cute mistake.